Determination of geochemical baseline and pollution assessment of surficial soil heavy metals in Harbin city

In this paper,based on sampling and testing on the spot,geo-accumulation index and pollution load index were selected to evaluate the four elements pollution in surficial soil(Hg,Cd,Pb,As),including 103 samples.geo-accumulation index can assess pollution degree in term of single factor and pollution load index was used to evaluate integrated pollution of the whole area.The step of visualization for the spatial heavy metals assessment was finished in ArcGIS workstation.Analyzing through geo-accumulation index,the pollution degrees of Hg,Cd,Pb,and As were dominated by the first grade and second grade,which is corresponded to non-pollution,slight pollution or moderate pollution.The third grade also exists,especially Hg.In addition,the last two pollution levels exist for the metals of Hg and Cd whose percentage are very low.The results are gained by using pollution load index,point pollution load index(IPL)mainly belongs to the first grade and zone pollution load index(IPLzone)is 1.478,which belongs to the first grade.